Bibliographies thématiques / Volumetric block proportion

Littérature scientifique sur le sujet « Volumetric block proportion »

Auteur : Grafiati

Publié le 14 mars 2023

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Articles de revues sur le sujet "Volumetric block proportion"

Zhu, Guojin, Yu Ding et Yajun Cao. « The Effect of Block-Matrix Interface of SRM with High Volumetric Block Proportion on Its Uniaxial Compressive Strength ». Applied Sciences 13, n^o 6 (8 mars 2023) : 3463. http://dx.doi.org/10.3390/app13063463.

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The soil–rock mixture (SRM), as a heterogeneous and discrete geomaterial, can be widely found in nature and may present difficult design and construction issues for structures within or on top of them. Engineers face a difficult problem when determining the mechanical behavior of geomaterials with SRM, especially those with a high volumetric block proportion (VBP). As it is often very difficult to prepare undisturbed and representative samples of these materials. Thus, this paper proposes a novel method that can generate SRM models with a high VBP and produce a block-matrix interface (BMI) around the rock block, which can simulate unwelded SRM in nature. Then, the finite difference method (FDM) is applied to simulate uniaxial compression tests. The conformity of the numerical simulation results with the experimental results shows that the method is reasonable and effective. In addition, the effect of the strength of the BMI, the thickness of the BMI, and the geometrical shape of the rock blocks on the uniaxial compressive strength (UCS) of the SRM are also investigated. The modelling approach proposed in this paper is able to generate BMI in SRMs and enables the effect of the BMI on the SRMs’ properties to be better investigated in numerical simulations. This method can overcome the difficulties of preparing representative and undisturbed experimental cores while saving cost and improving efficiency. Simultaneously, the method proposed in this paper is promising to be extended to three dimensions.

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Wang, Shengnian, Yue Li, Xinqun Gao, Qinpei Xue, Peng Zhang et Zhijian Wu. « Influence of volumetric block proportion on mechanical properties of virtual soil-rock mixtures ». Engineering Geology 278 (décembre 2020) : 105850. http://dx.doi.org/10.1016/j.enggeo.2020.105850.

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Nikolaidis, G., et C. Saroglou. « ENGINEERING GEOLOGICAL CHARACTERISATION OF BLOCK-IN-MATRIX ROCKS ». Bulletin of the Geological Society of Greece 50, n^o 2 (27 juillet 2017) : 874. http://dx.doi.org/10.12681/bgsg.11793.

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Block-in-matrix rocks (“bimrocks”) are complex, mixed and heterogeneous formations of competent blocks embedded in weaker matrix. The inherent difficulty of sampling and consequently, laboratory testing of bimrocks leads to considerable challenging in geotechnical design and assessment of their engineering behaviour. An approach for the characterisation of “bimrocks” is the use of stereological analysis that extrapolates one-dimensional or two dimensional data to estimate the block volumetric proportion. This has been an established approach of dealing with bimrocks and melanges for the last two decades. This paper presents the parameters that are considered important for the engineering characterisation of such complex formations, while a case study from a bimrock in NW Greece is discussed.

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Ramos-Cañón, Alfonso Mariano, Lady Carolina Castro-Malaver, Nelly Vanessa Padilla-Bello et Carlos Alberto Vega-Posada. « Incertidumbre en la determinación del Porcentaje Volumétrico de Bloques de BIMrocks/BIMsoil a partir de información unidimensional ». Revista Boletín de Geología 42, n^o 1 (1 janvier 2020) : 69–80. http://dx.doi.org/10.18273/revbol.v42n1-2020004.

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La caracterización mecánica de depósitos de materiales heterogéneos (BIMrocks/BIMsoil – Block in Matrix) requiere del conocimiento de la cantidad de bloques inmersos en una matriz débil (Proporción Volumétrica de Bloques, PVB). La aleatoriedad en el proceso de formación de dichos depósitos impide obtener información unívoca mediante estudios geotécnicos convencionales. Es posible reconocer que a medida que aumenta el número y la profundidad de las perforaciones, se disminuye la incertidumbre en la determinación de la PVB, sin embargo, la cuantificación de la disminución de la incertidumbre no ha sido abarcada de manera comprensiva. La determinación de la PVB en materiales BIMrock/BIMsoil tiene asociada una incertidumbre que se ha estudiado con modelos físicos y analíticos. Dichos modelos no consideran la influencia de factores como el tamaño, forma y orientación de los bloques, que simultáneamente inciden en la cuantificación de la incertidumbre en la PVB.En este trabajo se desarrolló un algoritmo y se implementó computacionalmente para analizar la influencia de la longitud y el número de las perforaciones, junto con la forma y orientación de los bloques, sobre el nivel de incertidumbre en la determinación de la PVB. Los resultados sugieren que a mayor investigación del subsuelo (número y longitud de perforaciones), independiente de la forma, tamaño y orientación de los bloques, se disminuye la incertidumbre epistémica en la PVB. Sin embargo, dicha incertidumbre tiene un límite inferior que obedece a la naturaleza aleatoria propia de la formación del material BIMrock/BIMsoil

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Samsonova, Maria, Elvira Semenova, Christina Kotova et Leonid Salogub. « Additional heat loss of jamb in enclosing structures ». E3S Web of Conferences 263 (2021) : 03017. http://dx.doi.org/10.1051/e3sconf/202126303017.

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One of the urgent problems today is to increase the energy efficiency of civil buildings. There is a need at the design stage to choose structures and design solutions that will compensate for the increasing consumption of energy resources in civil engineering. This article compares different building envelopes used in the construction of residential buildings: a volumetric block and a wall made of aerated concrete blocks. To determine the most energy efficient design solution construction is compared in different climatic regions. One of the most vulnerable places of a wall, from the point of view of energy efficiency, is a window jamb. In this article, an analysis is carried out to determine the construction with the lowest heat loss window jambs. Using the ELCUT software temperature fields and additional heat flux densities are calculated. According to the calculation, the proportion of heat loss due to window slope from heat loss according to the surface of the structure was determined. The heat flux density of the homogeneous section of the wall of the volume block is 1.28 times higher on average than in the aerated concrete wall. Regardless of the climatic conditions, the junction of the window jamb in buildings made of insulated panels of volumetric blocks is more energy efficient than the same junction in a building with aerated concrete walls.

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Kahraman, S., M. Alber, M. Fener et O. Gunaydin. « An assessment on the indirect determination of the volumetric block proportion of Misis fault breccia (Adana, Turkey) ». Bulletin of Engineering Geology and the Environment 74, n^o 3 (11 septembre 2014) : 899–907. http://dx.doi.org/10.1007/s10064-014-0666-9.

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Wang, Shuaifeng, Yinlian Yi, Xiaochang Li, Shaoqiang Zhang et Zixin Zhang. « Investigation of Volumetric Block Proportion (VBP) Effect on Excavation-Induced Ground Response of Talus-like Rock Mass Based on DEM Simulations ». Materials 15, n^o 24 (14 décembre 2022) : 8943. http://dx.doi.org/10.3390/ma15248943.

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Due to the complexity of the talus-like rock mass with different values of volumetric block proportion (VPB), it is thus crucial to explore the VBP effect on the excavation-induced ground responses. We conduct a series of 2D DEM (discrete element method) simulations on a common circular tunnel excavation in the talus-like rock mass with different VBPs (0%, 15%, 50%, 85% and 100%). For each VBP, two support scenarios, i.e., unsupported and supported by a rigid lining, are considered. The micro characteristics of the excavation-induced ground responses, including the contact force, force chain, coordination number and shear-slip contact, and the stress distribution and ground settlement are elaborated in detail. Accordingly, three types of talus-like rock masses are identified as soil-, hybrid- and rock-types, corresponding to VBP = 0–15%, 50%, and 85–100%, respectively. It is found that the lining support is essential for maintaining the ground stability of a tunnel excavation in the soil- and hybrid-type talus-like rock masses while the backbones formed by rock blocks in the rock-type talus-like rock mass can provide a certain support for the surrounding ground. Our findings have important implications for optimizing the construction scheme of tunnel excavation in different types of talus-like rock masses.

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Winarno, S. « Preliminary Study on Hand-cast Lightweight Concrete Block using Raw Rice Husk as Aggregate ». IOP Conference Series : Earth and Environmental Science 933, n^o 1 (1 novembre 2021) : 012005. http://dx.doi.org/10.1088/1755-1315/933/1/012005.

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Abstract Raw rice husk is an abundantly available waste material in Indonesia as one of rice producing countries. Due to rice husk is light in weight and convex in shape, this paper presents a preliminary application of raw rice husk as natural aggregate in order to make lightweight concrete blocks. Concrete specimens contained Portland Cement, filler, and raw rice husk, in which the mix proportion was in volumetric ratio, i.e 1.25 cement and 2.75 filler constantly, whereas dosage of rice husk varied from 8.5 to 10. The production of the concrete block was by mixing the ingredients together and then the mixture was casted and compacted on moulds by hand manually. Series laboratory experiments were accomplished to analyse the compressive strength and density. For this, four groups of mixes were prepared. The results have shown that the higher proportion of rice husk is the lower its compressive strength and the lighter its density. At proportion of 1,25 cement: 2,75 fillers: 8,5 raw rice husks, the compressive strength is 26.64 kg/cm2 and this satisfies the minimum standard (25 kg/cm2). Unfortunately, the density is 1,536.73 kg/m3 and it is higher than the maximum standard of 1,400 kg/m3. Thus, it is important to research further by making and testing some improved specimens with more cement, more rice husk, and less filler to fulfil strength and density.

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Tuo, Wang, Qi Fuzhou et Chang Jucai. « Analysis of Energy Transmission and Deformation Characteristics of Coal-Rock Combined Bodies ». Geofluids 2022 (28 juin 2022) : 1–11. http://dx.doi.org/10.1155/2022/5304250.

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A coal-rock system is a common combination form in coal mines. In order to explore the energy interchange law of a coal-rock combined body and the interaction relationship between the two bodies, loading tests of coal-rock combined bodies with different height ratios were carried out. The loading path of rock in coal-rock combined bodies was demonstrated by means of a single loading and unloading test of the same-sized rock sample. Furthermore, a method to calculate rock energy was proposed based on the area of the loading and unloading curve. The experimental results show that the greater the surrounding rock pressure is, the smaller increase rate of lateral and volumetric strain in the postpeak stage will be when the same height ratio is present. An increase in the surrounding rock pressure causes an increase in the total strain energy density of small-sized rock samples. However, the total strain energy density is always greater than the elastic strain energy density. And the elastic and dissipated strain energy densities also increase, along with the energy dissipation with unloading. When the proportion of coal bodies increases, the energy accumulation also shows an increasing trend. When the height of the coal is greater than half the height of the complete specimen, the coal energy proportion is greater than 60%. After reaching the yield load, the energy in the coal body is dissipated in forms such as plastic deformation, internal damage, block friction, radiation energy, and kinetic energy. Therefore, the energy released is, in part, reflected in the rock body.

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Douglas, D. Stokke, et G. Manwiller Floyd. « Proportions of Wood Elements in Stem, Branch, and Root Wood of Black Oak (Quercus Velutina) ». IAWA Journal 15, n^o 3 (1994) : 301–10. http://dx.doi.org/10.1163/22941932-90000612.

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The volumetrie proportions of vessel elements, fibres, rays, and axial parenchyma plus vasicentric tracheids were determined for the stern, branch and root wood of threc black oak (Quercus velutina Lam.) trees. There were statistical differences in the proportions of wood elements between locations within the trees sampled, i.e., branches, sterns, roots, oblique roots, and lateral roots. Branches had the highest proportion of vesseI elements, whereas sterns had the greatest proportion ofaxial parenchyma plus vasicentric tracheids. The highest proportions of rays were found in root wood. Fibre proportion was greatest in the stern and branch wood.

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Thèses sur le sujet "Volumetric block proportion"

Wu, Ting-Hua, et 鄔定樺. « Uncertainty in Estimation of Volumetric Block Proportion by Using Scanline Method -Analytical Solution and Demonstrate ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/58230234268265448914.

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碩士
國立中央大學
土木工程研究所
98
This research discusses “scanline method” which is used in volume block proportion (VBP) for uncertainty. The major factor which affects the uncertainty of VBP is different scanline lengths. Kuo(2005) uses four kinds of representative volume element (RVE) with different outer edge shape and ellipse or the circular blocks connects the different length of the scanline by simple random sample to simulate VBP uncertainty. This research use the statistical sample point, the central limit theorem, and the length of computation for the uncertainty analytic solution, to explain the Kuo(2005) result of simulation. This research showed the analytic solution match the numerical simulation of Kuo(2005). For the in-situ data, we suggest that use analytic solution of this research to calculate the scanline method for measuring VBP uncertainty.

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